x1, y1, x2, y2 = map(float, input().split())
import math
ans = math.sqrt((x1 - x2)*(x1 - x2) + (y1 - y2)*(y1 - y2))
print("{0:.8f}".format(ans)) x1, y1, x2, y2 = map(float, input().split()) x1 map(float, input().split()) map float input().split() ().split () input split y1 x2 y2 import math math ans = math.sqrt((x1 - x2)*(x1 - x2) + (y1 - y2)*(y1 - y2)) ans math.sqrt((x1 - x2)*(x1 - x2) + (y1 - y2)*(y1 - y2)) math.sqrt math sqrt (x1 - x2)*(x1 - x2) + (y1 - y2)*(y1 - y2) (x1 - x2)*(x1 - x2) x1 - x2 x1 x2 x1 - x2 x1 x2 (y1 - y2)*(y1 - y2) y1 - y2 y1 y2 y1 - y2 y1 y2 print("{0:.8f}".format(ans)) print "{0:.8f}".format(ans) "{0:.8f}".format "{0:.8f}" format ans x2, y2 = map(float, input().split()) map(float, input().split()) x2 y1, x2, y2 = map(float, input().split()) map(float, input().split()) y1 ans = math.sqrt((x1 - x2)*(x1 - x2) + (y1 - y2)*(y1 - y2)) math.sqrt((x1 - x2)*(x1 - x2) + (y1 - y2)*(y1 - y2)) ans x1, y1, x2, y2 = map(float, input().split()) map(float, input().split()) x1 y2 = map(float, input().split()) map(float, input().split()) y2
x1, y1, x2, y2 = map(float, input().split())
import math
ans = math.sqrt((x1 - x2)*(x1 - x2) + (y1 - y2)*(y1 - y2))
print("{0:.8f}".format(ans))